True. Interestingly, mine has more than I had expected. I haven't seen some of this junk for decades. I have 180v, 240v, 300v. I'm not sure why. I've been collecting stuff since the 60's. Of course I had nothing in the needed range! So I strung together a bunch of 12s and 15s to get 66v. That should be close enough, right? Doesn't work. It makes it worse. I also tried the voltage divider with the 1N4148, which did the same thing. I checked the signal with my scope and I can see it clamping nicely at the zener voltage. At this point I realized I had never looked at these signals with a scope before at all. Without this clamping circuit I see what looks like ringing or oscillation riding along the top of the DC level when the transistor is off. It's about 20 or 30 volts p-p somewhere around 8khz. Strange?
On Monday, September 10, 2012 10:43:11 AM UTC-4, Frank Bemelman wrote: > > Sure, a zener will also work. It�s just that most junkboxes have so > few high volatge zeners in them ;-) > > > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/8zSnENQEsA8J. For more options, visit https://groups.google.com/groups/opt_out.
